Investigating Phosphorus Abundances in a Sample of APOGEE-2 Bulge Globular Clusters
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| Autores principales: | , , , , , , , , , , , |
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| Formato: | Preprint |
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2025
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| author | Barbuy, Beatriz Fernández-Trincado, José G. Camargo, Morgan S. Geisler, Doug Brauner, Maren Villanova, Sandro Minniti, Dante García-Hernández, Domingo Anibal Souza, Stefano O. Ernandes, Heitor Friaça, Amâncio Pignatari, Marco |
| author_facet | Barbuy, Beatriz Fernández-Trincado, José G. Camargo, Morgan S. Geisler, Doug Brauner, Maren Villanova, Sandro Minniti, Dante García-Hernández, Domingo Anibal Souza, Stefano O. Ernandes, Heitor Friaça, Amâncio Pignatari, Marco |
| contents | Phosphorus enhanced (P-rich; [P/Fe] > 0.8) giants have been found among mildly metal-poor fiels stars, but in only one star in a globular cluster (GC), M4 (NGC 6121). Also, in a sample of bulge spheroid stars, some of them showed a moderate P-enhancement in the range +0.5 < [P/Fe] < +1.0. In this paper we derive the P abundance of moderately metal-poor ([Fe/H] ~-1) GC stars, aiming to check if the phenomenon could be related to the unusual multiple stellar populations found in most GCs. Here we present the detection of P-moderately enhanced stars among two out of seven bulge GCs (Tonantzintla 1, and NGC 6316_, with metallicities similar to those of the bulge field P-rich stars. Using H-band high-resolution (R~22,500) spectra from the APOGEE-2 survey, we present the first high-resolution abundance analysis of [P/Fe] from the PI 16482.932 A line in a sample of selected bulge GCs. We find that all P-rich stars tend to also be N-rich, that hints at the origin of P-rich stars as second-generation stars in GCs. However no other correlations of P and other elements are found, that are usually indicators of second-generation stars. Further studies with larger samples and comparisons with field stars will be needed before any firm conclusions are drawn. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_11207 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Investigating Phosphorus Abundances in a Sample of APOGEE-2 Bulge Globular Clusters Barbuy, Beatriz Fernández-Trincado, José G. Camargo, Morgan S. Geisler, Doug Brauner, Maren Villanova, Sandro Minniti, Dante García-Hernández, Domingo Anibal Souza, Stefano O. Ernandes, Heitor Friaça, Amâncio Pignatari, Marco Solar and Stellar Astrophysics Astrophysics of Galaxies Phosphorus enhanced (P-rich; [P/Fe] > 0.8) giants have been found among mildly metal-poor fiels stars, but in only one star in a globular cluster (GC), M4 (NGC 6121). Also, in a sample of bulge spheroid stars, some of them showed a moderate P-enhancement in the range +0.5 < [P/Fe] < +1.0. In this paper we derive the P abundance of moderately metal-poor ([Fe/H] ~-1) GC stars, aiming to check if the phenomenon could be related to the unusual multiple stellar populations found in most GCs. Here we present the detection of P-moderately enhanced stars among two out of seven bulge GCs (Tonantzintla 1, and NGC 6316_, with metallicities similar to those of the bulge field P-rich stars. Using H-band high-resolution (R~22,500) spectra from the APOGEE-2 survey, we present the first high-resolution abundance analysis of [P/Fe] from the PI 16482.932 A line in a sample of selected bulge GCs. We find that all P-rich stars tend to also be N-rich, that hints at the origin of P-rich stars as second-generation stars in GCs. However no other correlations of P and other elements are found, that are usually indicators of second-generation stars. Further studies with larger samples and comparisons with field stars will be needed before any firm conclusions are drawn. |
| title | Investigating Phosphorus Abundances in a Sample of APOGEE-2 Bulge Globular Clusters |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2509.11207 |